sedimentary
Sandstone (Molds/Casts)
Quartz arenite with fossil molds
AI-generated identification · may be incorrectHardness 6-7 on Mohs scale, tan to brown color, dull luster, granular texture, composed primarily of quartz grains with weathered fossil voids.
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Physical properties
Hardness 6-7 on Mohs scale, tan to brown color, dull luster, granular texture, composed primarily of quartz grains with weathered fossil voids.
Formation & geological history
Formed from the accumulation and cementation of sand-sized mineral particles in ancient marine or terrestrial environments over millions of years.
Uses & applications
Used in building construction, decorative stone, and as a key specimen for studying local paleontology and sedimentology.
Geological facts
The distinct depressions are fossil molds where shells or crinoid columnals dissolved out of the rock matrix over geological time.
Field identification & locations
Identify by its gritty texture and characteristic pitted surface. Common in sedimentary regions worldwide; valued primarily for educational and local collection.
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